Getting paid cash,(check), after a job "101"

#1 :Tell them you can't come out and do the job unless they will fork over a check afterwards.

(true story), Went out to fix an inferior welders work on a workover rig the other day. Told the pusher exactly that. Pusher told me to bring my certs, cert of insurance, and w-9.

Got a 1200.00 check

Yep, it works sometimes......